Consumption per capita between 20-40 yuan, an average of 30 yuan / person, a day business income of 30,000 yuan. A month of weekends 8 days, then peak season (weekend) revenue of 240,000 yuan.

Weekday attendance rate per meal calculated in accordance with 200%, the number of daily meals 320 people, calculated in accordance with the 300 people, then weekdays daily income 300 * 30 = 9,000 yuan, the off-season (a month of 22 weekdays) cumulative income of 198,000 yuan.

This means that the restaurant's monthly revenue amounted to 438,000 yuan. Considering that many people have already started their weekend life on Friday, it's normal to have a dinner in the evening, so the real operating income data will be more objective.